توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱TRANSPARENT ROOFS APPROACH TO SAVING SOLAR ENERGY AND LIGHTING
نویسنده(ها): ،
اطلاعات انتشار: ششمین کنفرانس بین‌المللی مسائل فنی و فیزیکی در مهندسی قدرت، سال
تعداد صفحات: ۵
In this article impressibility of passive solar system on transparent roofs is offered. They can advanced from transmission of a large amount of sun's spectrum and work as a sun–control. To investigate this effect, the influences of the light have been analyzed with two standpoints: 1.Visual and conceptual , 2. Technology and materials. The transmission of solar energy from roofs depends on different variables subjects, such as technological facilities of the region, climate, economy and some other elements and it causes some limitations in designing methods and use of the solar energy. The results show that the energy transmittance of the transparent roofs with smart materials is more less than standard simple glass<\div>

۲THE EFFECTS OF Bi ADDITION AND HEAT TREATMENT ON THE MICROSTRUCTURE AND TENSILE PROPERTIES OF AL–15%Mg2Si COMPOSITE
نویسنده(ها): ، ، ،
اطلاعات انتشار: اولین همایش بین المللی و ششمین همایش مشترک انجمن مهندسی متالورژی ایران، سال
تعداد صفحات: ۸
In current research, the influence of different concentration of Bi (0.01–0.3 wt.%) on the microstructure and tensile properties of Al–15%Mg2Si in situ metal matrix composite before and after heat treatment has been investigated. Optical microscopy (OM) and scanning electron microscopy (SEM) showed that 0.03 wt.% Bi addition not only changes the morphology of primary Mg2Si irregular to polyhedral shape and its average particle size decrease from ~65 μm to 20 μm but also showed that 0.03 wt.% Bi, morphology of the eutectic Mg2Si phase alters from flak like to fine fibers or rod like. The results of tensile testing demonstrated that the ultimate tensile strength (UTS) and elongation values of the composite increase with the addition of Bi (0.03 wt. %). The results also showed that applying solution heat treatment improves the toughness of the composite significantly<\div>

۳Effect of Cu–P master alloy on the microstructure and wear behaviour of Al– 25wt. %Mg2Si Metal matrix Composite
نویسنده(ها): ، ، ،
اطلاعات انتشار: سومین کنفرانس بین‌المللی آلومینیوم ایران IIAC2014، سال
تعداد صفحات: ۵
This study was undertaken to investigate the effect of Cu–15P master alloy (1%) as a modifier on the microstructure and dry sliding wear behaviour of Al–25wt.%Mg2Si particulate metal matrix composite (PMMC). In this work, composite was characterized by scanning electron microscope equipped with energy dispersive spectrometer (EDS), and dry sliding wear experiment were performed in a pin–on–disc wear tester against a DIN 100Cr6 steel disc at a speed of 573 rpm and normal loads of 10, 30 and 50 N on the 1000m sliding distance. By addition of Cu–15P master alloy to this composite, the primary Mg2Si morphology changes from dendrite to polygon with significant decreasing in mean diameter Mg2Si particles from 200μm to 20μm. This reduction in particles size results in improvement of tensile properties and hardness values of the composite. Wear test results also show that the addition of Cu–15p master alloy reduce the wear rate of the specimens after 1000m. The examination worn surfaces showed that the wear mechanism changed from adhesion in unmodified composite to abrasion regime in modified one<\div>

۴Effect of Zr on the microstructure of 6061 Aluminum alloy during SIMA process
نویسنده(ها): ، ، ،
اطلاعات انتشار: سومین کنفرانس بین‌المللی آلومینیوم ایران IIAC2014، سال
تعداد صفحات: ۵
In this study the effect of adding Zr on the microstructure of 6061 Al alloy during SIMA process has been investigated. The optimum amount of Zr containing master alloy for proper grain refining was obtained as 0.3 wt.%. After that SIMA process employed hydraulic press, recrystallization and partial melting (RAP) to obtain a fine globular microstructure. 40% strain, various heat treatment temperatures (605 to 645°C) and holding times (30 and 40 minutes) were investigated to reach an optimized fine globular microstructure. Microstructural study which was carried out bythe optical microscopy and MIP software exhibited the uniform equiaxed recrystallized grain structure. Observations showed that the presence of grain refining agents lead to finer distribution of intermetallics and more globular microstructure during SIMA process<\div>

۵The effects of heat treatment and antimony addition on the microstructure and wear properties of Al–15%Mg2Si metal matrix composite
نویسنده(ها): ، ، ،
اطلاعات انتشار: سومین کنفرانس بین‌المللی آلومینیوم ایران IIAC2014، سال
تعداد صفحات: ۵
This study was undertaken to investigate the effect of antimony addition and heat treatment on the microstructure and dry sliding wear behaviour of Al–15%Mg2Si particulate metal matrix composite (PMMC). In this work, composite was characterized by scanning electron microscope equipped with energy dispersive spectrometer (EDS), and dry sliding wear experiments were performed in a pin–on–disc wear tester against a DIN 100Cr6 steel disc at speed of 0.5 ms–1 and normal loads of 10, 30. The wear results showed that the addition of antimony simultaneously with the applying the heat treatment to Al–15%Mg2Si composite can lead to reduction of wear rate through decreasing the size of Mg2Si particles and reduction the stress concentration points. The Comparison of width of the wear tracks and the value of plastic deformation on the worn surface and hardness results confirmed this issue<\div>
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